Fluid pressure regulator



Nov. 16, 1943. F. H. KINDL FLUID PRESSURE REGULATOR Filed sept, e, 19:59-

4 Sheets-Sheet 1 BY -A ORNEY.

Nov. 16, 1943. F. H. KINDL FLUID PRESSURE REGULATOR Filed Sept. '6, 1939, 4 Sheets-Sheet 2 ATTORNEY.

Nov. 16, E943. F. H, KINDL FLUID PRESSURE REGULATOR 4 sneaks-sheet 3 Filed Sept. 6, 1939 ATTQRNEK Nw. 16, 1943. F H KINDL 2,334,496

FLUID PRESSURE REGULATOR Filed sept. e, 1959 4 sheets-sheet 4 ATTORNEY.

Patented-:Novi 'I 1943 t r I U-Nirg ruim PRESSURE manhattanl H." Kindl, `Pittsburgh, Pag, assigner to' Pittsburgh Equitable-Meter ljonipany, Pitts"- y burgh, Par, acorpo'ration of Pennsylvania Application September 6, 1939,v Serial No. 293,587 I 9 Claims.

The present invention relates to improvements in fluid pressure regulators, and relates particularly to improvements in iiuid pressure regulators designed to act as pilot valves. to control the operation of a main regulator or valve, and to the systems using my improved pilot valve. This application is a continuation in part of my application for pressure control systems, Serial No. 260,049, iiled March 6, 1939, which matured into Patent No. 2,273,111, on February 17, 1942, and it is intended to incorporate herewith by reference, the full disclosure of said application.

It is an object of this invention to provide a regulator which is sensitive to small changes in pressure.

Another object of the invention is the provision of a regulator in which the ratio of valve opening to pressure control may be adjusted within certain limits.

A further object of the invention is the provision of a regulator having separate loading and control chambers and which is responsive substantially solely* to changes in the control pressure.

Another object is the provision of a regulator which may be readily utilized as a downstream pressure regulator or a back pressure regulator.

Still another object of the invention is the y provision of a pilot loading or control system' which will maintain a constant outlet pressure inthe system over a wide range of flows.

A further object is the provision of a regulator system of the pilot loading or control type in which the pilot bleed may be bled to atmosphere or back into the low pressure line.

These and other objects of the invention will beA apparent from a consideration of the following specification taken in connection with the accompanying drawings, wherein I have shown preferred embodiments of my invention by Way of example, and wherein:

Figure l is a vertical section through a preferred embodiment of my pilot regulator,

Figure 2 is a vertical section corresponding to- Figure 1 of a modication,

Figure 3 is a vertical section taken on line IIL-III of Figure of a further modification employing a loading chamber separate from the control chamber,

Figure 4 is a fragmentary vertical sectional View taken on line IV-IV of Figure 5,

Figure 5 is a plan view of Figure 3,

Figure 6 is a fragmentary vertical sectional view corresponding to Figure 4 of a modification,

Figure 7 is a vertical sectional view of a further modification,

Figure 7a is a sectional view of a further modification,

Figure 8 is a view partly diagrammatic, showing a pilot loading or control system employing my improved regulator, and

Figure 9 is a partly diagrammatic view show:- ing a modified loading and control system employing my improved regulator controlled by back pressure. i

Referring to Figure 1 o`f the drawings, there is shown a casing l having a central hub 2 which is bored at 3, and the casing has radial spokes 4 and 5 integrin with the casing and hub. Bores 6 and 'I through the spokes communicate with the central bore 3 in the hub. A cylindrical well or recess 8 shown integral with the casing I is adapted to receive 4a suitable filter Bsecured to a threaded plug I0 in any suitable manner, and has an inlet I I to permit the entry of uid from any suitable high pressure source therein. Bore 6 communicates with thewell 8 and has a valve orifice bushingv I2 threaded therein having an oriiice 4 4 therethrough, the bushing terminating in a receding valve face I5 around the orice.

A non-circular valve member I6, which, as shown, is in the form of ahexagonal plug, is slidably` received in the bore 6 andcarries azvalve insert I'I at its end which is adapted to seat against the valve face I5 ofthe valve bushing I2. A light y spring I9 is interposed between the Vvalve member I6 and the valve bushing I2 against suitable shoulders provided thereon. v

A diaphragm 2l is secured atits periphery between the spring cover 22 and the upper surface of casing I, anda cylindrical guide member 23 extends through bore 3 with a. close guiding iit and at its upper end is secured to the diaphragm 2| by a cap screw 24, the diaphragm being clamped thereby between washer 25 and diaphragm plate 26. Connecting member 23 may be machined cylindrical from hexagonal bar stock, leaving a hexagonal head 21 at one end. The spring 28 in the recess 29 in the cover bears against the diaphragm 2| and by means of a threaded adjustment plug 3| in the recess the spring may be adjusted to exert the proper loading eiect on the diaphragm 2l. The outlet end of spring recess 29 is closed by a cap 32 and a suitable vent 33 is provided in the cover 22.

Valve member I6 has a conical recess 35 in. its end which receives one end of a rod 3B suitably rounded at its end to provide a bearing surface of reduced area and thus reduce friction, and

the connecting member 23 is transversely bored at 31 to slidably. receive the opposite end of rod 36. A shoe 38 is slidably disposed in the bore 1 and has a conical recess 39 in one end to receive a rod 4I having one end in the recess 39 and the other end in bore 31 in abutting relation to rod 36. The shoe 38 serves as an extra or replacement outlet valve member and for this purpose is constructed like valve member I6 with a valve insert 42 therein. A plug 43 threaded in the bore 1 has an end 45 engaging the valve seat member 42 to adjust the movement of the shoe 38, and a plurality of holes 44 provides an outlet for fluid.

An outlet chamber 48 is provided in the regulator body and a bore 49 in the wall of spoke 4 connects the outlet chamber with the outlet oriflce 44 when the abutment or valve member 38 is open. A similar bore I inthe wall of spoke 5 connects outlet chamber 48 with the inlet orifice I4 when valve I6 is open. As the spokes 4 and 5 do not lill the whole central space of the casin-g, it will be apparent that the chamber 48 is closed on the upper end by diaphragm 2| and pressure in chamber 48 is applied to the underside of the diaphragm. The pli-lg 53 in the casing provides access to the central guide member 23 when this member requires replacement or repair, and plugs 55 and 54 close the holes in the casing that are made in order to drill holes 49 and 5|.

The operation of the regulator now will vbe described. Fluid under pressure enters the inlet passing through the lter 9, and when the valve I6 is open passes through the Orice I4 and through the passage 5| into the outlet chamber 48, and passes through passage 49 and orifices 44 from chamber 48, and thence by any suitable conduit connected at 46 to any desired point. The pressure in chamber 48 thus will depend generally on the difference in rates 0f ow into and out of chamber 48. When the pressure in the outlet chamber 48 builds up so as to counterbalance the effect of the spring 28 on the diaphragm 2|, the diaphragm and central guide member 23 are moved upwardly, thus causing rods 36 and 4| to approach alignment and thus force the valve I6 against its seat I5 to cut down or stop flow through the orifice I4 until the pressure in chamber 48 falls sufficiently to enable spring 28 to move connecting member 23 downwardly to again cause the valve to open. Washer may limit the amount of opening of valve I6 by its engagement with hub 2, and it will of course be understood that sufiicient working range of movement is thus provided. Within the limits thus provided, the response of the regulator may be varied by adjustment of the plug 43 to vary the position of shoe 38 in closed position of the valve and thus vary the ratio of movement of valve member I6 to movement of diaphragm 2|. Spring I9 is strong enough to insure that the valve member I6 follows -the movement of the toggle rods 36 and 4I.

In the modification shown in Figure 2, wherein like parts are correspondingly numbered, the body 60 has a somewhat different form and has an outlet connection 6| in its bottom and a spring cover 62 of somewhat different shape than cover 22 clamps diaphragm 2| to the body. The body has a central recess 63 corresponding to outlet chamber 48 of Figure 1, and a central guide member 64 is located in the hub 2 and provides a clearance space 65 with the bore 3. Plate 61 is recessed at 68 to receive the upper end of guide I 2 except as hereinafter noted.

member 64, and the diaphragm 2| is clamped between plates 66 and 61 by the spring 28. A rod 69 extends through a bore 10 in the guide member 64 and between the bifurcations 1| of the hub 2 to prevent turning of the guide member. The central guide member 64 has a bore 13 therein in which is iltted a hexagonal shoe 14 with a close sliding t, this shoe having generally tapered recesses 16 and 11. in the opposite ends thereof. Toggle rod 36 has one end engaging the valve I6 and the other end engages in recess- 16 of the shoe 14, and one of the toggle rods 4| engages the recess 11 in the shoe 14 and the other end engages the abutment member 38. The position of abutment member 38 is determined by an adjustment plug 18 threaded in the bore 1 and having an extension 19 engaging the shoulder 8| of the abutment member 38. This construction prevents contact of the seat insert I1 with the plug 18 and thus preserves the seat against being crushed. The end of bore 1 is closed by a pipe plug 82 or by any other suitable means.

A bushing 83 having an orice 84 therein is located in the outlet connection 6I of the regulator, and this bushing provides one abutment for a light spring 85, the other end of the spring bearing in a suitable recess 86 at the bottom of the guide member'64. The spring 85 serves to substantially counterbalance the weight of the parts carried by the guide member.

The adjustment for the spring 28 for biasing the regulator comprises a threaded stem 81 having a collar 88 thereon abutting the shoulder 89 of the cover 62 and having an extension 9| to which is secured any suitable type of handle 92. An abutment nut 93 moving in suitable guides in the cover is threaded to the stem B'Iand upon turning the handle 92 the nut 93 is moved inwardly or outwardly to adjust the compression of spring 28 to suitably bias the diaphragm 2| In the modification shown in Figures 3 to 5 I employ a balancing diaphragm which serves to separate the outlet pressure from the control pressure of the pilot regulator. In this modification the control diaphragm 95 is clamped at its outer periphery between the body 96 and a bottom cover 91, and at its center control diaphragm 95'is clamped by nut 98 between plates 99 and |00 to the bottom portion of central guide -member |0I. The guide member IOI Ihas a clearance I 02 With the central hub 2 as previously described in connection with Figure 2, and at its top is connected to the center of diaphragm 2| as previously described. The outer periphery of diaphragm 2| is held to the body 96 by a modified spring cover |03 secured thereto by bolts I 04 (Figure 5) and double springs |05 and |06 may be provided therein to bias the diaphragms. These springs may be adjusted by a threaded stem 81 having a suitable nut |01 thereon similar to nut 93, the outer end of the stem having a non-circular portion |08 adapted to receive a handle or wrench. A cap |09 threaded into a recess IIO normally encloses the end of the stem.

The toggle arrangement for operating the valve I6 is like that described in connection with Figure An abutment thimble III is threaded into the bore 1 and has a recess II2 with a piston I|3 therein which is urged in one direction by spring II4, a pin ||4 extending into a slot II 5 in the piston serving to limit movement thereof and spring |I4 is under initial bias urging piston ||3 against the pin. The piston I|3 has a tapered recess II5 which receives one end of toggle rod 4|. The thimble I I I is locked in position by a locking plug |I6 and the end of bore 1 is closed by pipe plug 82. The purpose of this construction is to provide a yieldable abutment ||3 so that Awhen the valve I6 is closed any further movement of the central guide member will not crush the valve insert I1. It also will be observed that the toggle rods 36 and 4| in this modification are pointed at their ends thus providing a. bearing surface of reduced area that reduces friction. A spring ||1 may be interposed below plate |00 to substantially counterbalance the weight of connecting member I0| and the parts carried thereby.

In this modification there is provided a loading pressure chamber |20 between diaphragms 2| and 95, and a control chamber |2| on the under side of the diaphragm 95. By referring to Figure 4 it will be seen that there is provided a passageway |22 connected at one end with load` ing chamber |20 and passing through the clamped periphery of diaphragm 95 and through the bottom cover 91 to connect with a horizontal bore |23 located in a, boss IIS on the cover which connects with the loading Ioutlet |24. Borev |23 may be closed at its end by a plug |25. The fluid pressure in chamber |20 thus is conducted to loading outlet connection |24 whereby it is conducted to the apparatus to be loaded thereby. A bushing |26 having a bleed orifice |21 therein is provided to allow escape of fluid from loading outlet |23 into control chamber |2| and from thence by control connection |29 (Figure 3) to any suitable point of discharge. Control connection |29 located in a boss |20 on the cover offset from boss ||8 is connected to the pressure to be l controlled.

The operation of the modification shown in Figures 3 to 5 now will be described. High pressure fluid enters through the valve orifice I0 when the valve is open into the loading chamber |20, where it becomes the loading pressure, and thence the fluid flows through bore |22 (Figure 4) and passage |23 into the loading outlet connection |24. From there the fluid slowly escapes through bleed orifice |21 into the control chamber |2| and flows from the control chamber through passage |29 (Figure 3) back to the low pressure side of the line or to any other source of control pressure. By reason of the small size of orice- |21 and large size of control connection |29 the amount of high pressure fluid flowing from loading outlet |24 therethrough into control chamber |20 produces substantially no effect or change in pressure in the control chamber |2I. The pressure in control chamber I2I, therefore, is determined by the pressure at the control point to which connection |29 is made. Itwill be noted that the loading pressure in chamber |20 is exerted in opposite directions on diaphragms 2| and 95 and by selecting these dia-v phragms to haveequal exposed areas the effect of any variations in loading pressure is balanced' out and the assembly comprising diaphragms 2| land 95 become responsive solely to the control pressure in chamber |2l. This action may be explained as follows.

The bias of springs m5 and |05 tends'. to force y guide member fidi Ndownward.'and thus open valve it. However, assumingno pressure in 4chamber .l 2d, valve it would be closed when the combined action of spring-lll and the pressure in control chamber l2 i issuiicient to sumed that vfluid undervpressure is introduced through valve I4 into chamber |20, the force of ythis uid exerted upwardly against the diaphragm 2| is exactly equal to the force of this fluid exerted downwardly against the diaphragm 95 so that the valve I0 still remains solely responsive to changes in pressure in the control chamber I2 I, and changes in pressure in chamber |20 will in no way influence the action of valve |8 to cause it to open or close.

If desired, the regulator shown in Figures 3 to 5 may be modified as shown in Figure 6, the bleed orifice bushing |21 being replaced by a solid plug |30, plug |25 being removed and a bleed orice bushing |3| having an orifice |32 being inserted in bore |23 whereby the loading pressure bleeds to atmosphere.

In Figure '1 I have illustrated how the regulator shown in Figures 3, 5 and 6 may be converted into a back pressure regulator. This is accomplished by disassembling the regulator, inverting guide member I0| and re-assembling the regulator. In this modification it will be seen that because of the inverted position of toggle rods 36 and 4| when the guide member I0| is in its uppermost position, the valve i6 is open and when the guide member ||l| is in its lowermost position the valve I6 is closed. The control chember |2| is connected by aligned bores |35 and |36 to the Well E at the high pressure side having the strainer 9 therein so that thechamber |2| is controlled by the pressure on the high pressure side of the regulator. `The end of connection |29 is plugged by a plug |31, and a solid plug |30 is provided to separate chamber |2| from loading con-l nection |24, as shown in Figure 6.

This modification operates as follows. Fluid from the vhigh pressure side enters the chamber |2| through aligned passages |35 and |36 to exert a controlling force on the diaphragm 95. When the pressure in chamber |2| counterbalances the effect of the springs |05 and |06 the diaphragm 05 is forced upwardly and with it the guide member |0I, thus moving the toggles 36 and 4I away from aligned position and opening valve I6 to admit high pressure fluid into the chamber |20. Fluid flows from chamber |20 by passage |22 (Figure 6l passage |23 and loading connectionl |24 to the regulator to be loaded, and the loading pressure bleeds through orifice |32 (Figure 6) to atmosphere or back to the low pressure line through a suitable conduit adapted to 4be connected at the end of bore I 23.

In Figure 8 I have shown a system employing my improved pilot regulator in conjunction with a main regulator in Vwhich the valves open .by downward movement. This system comprises a high pressure main |40, a low pressure main |4| and a Valve bowl |42 interposed therebetween. This valve is diagrammatically shown and may be of any suitable construction and preferably is of the balanced type opening upon downward movement of the valves. A stem |43 suitably connected to the valve members |44 is connected at its upper endto the diaphragm |05 secured in a case ployed .to provide a suitable bias on the valves itt j uSt overbalance the v:force vof :springs i and l't. llinow it is assii-.as -to substantially overbalance the weight; Yof

the valves-Mil and parts 'connected "therewthrto maintain the VValves v-in normally 'closed position.

The pilot regulator is shown in elevation @at di@ and is constructedas hereinbefore described-'fer example` in Figures '3, 4 .antifa The pilot regulator |50 has its inlet I| connected by a conduit |52 to the high pressure main |40 and the loading outlet pipe |24 of the pilot regulator is connected to the chamber 41 of the main regulator case. The control outlet |29 (Figure 3) is connected by conduit 53 to the low pressure main |4I, and the end of passage |23 is closed by a plug |25. A conduit |54 is also connected between the conduit |53 and the chamber |48 of the main regulator, and may have a suitable restriction therein, if desired. The pressure in main |4| is transmitted through conduit |53 and conduit 54 to chamber |48, and by conduit |53 and passage |29 (Figure 3) to the control chamber I2I. The double acting safety valve |55 connected to chambers |41 and |48 is of known construction and maintains a predetermined maximum diiierence in pressures in chambers |41 and I 48 should a sudden surge of pressure occur in either chamber above a predetermined differential.

In this modification the pressure in main |4| is to be controlled by the valves |44 connected to the diaphragm |45, and pilot regulator |50 maintains a predetermined loading pressure in chamber |41. The diaphragm |45 responds to the difference in pressure in chambers |41 and |40 to control the position of valves 44. Control chamber |2| of the pilot regulator is connected to main |4I and when the pressure in main |4| falls below a predetermined value it permits diaphragm 95 of the pilot regulator and connecting member |I to move downwardly and thus open valve I6 and allow a greater loading pressure to vbuild up in loading or balancing chamber |20.

This loading pressure is conducted by passage |22 (Figure 4) bore |23 and loading connection |24 to the chamber |41 above the diaphragm |45 and causes the valve |44 to open to allow an in creased flow therethrough to re-establish the desired predetermined pressure in main |4I. The loading pressure slowly bleeds from chamber |41 through connection |24 (Figure 4) and bleed orice |21 into control chamber I2I and thence by passage I 29 and conduit |53 (Figure 8) to the low pressure line |4I. However, the small oriiice |21 and relatively large passage |29 prevents any appreciable change in pressure in chamber I2I due to this bleed.

When the pressure in main I4I rises too high, the pressure is conducted to control chamber |2| (Figure 3) and causes valve I6 to close and remain closed until the viiuid escaping through bleed orifice |21 allows the pressure in'chamber |41 to fall until spring |49 and the pressure in chamber |48 close valves |44 or reduce the ow therethrough suflciently to lower the pressure in main |44 to the desired value.

shown in Figures 1 to 5 of my said pending application.

It will be observed, with particular reference to Figures 8 and 3, that if diaphragm 95 has a.

greater area than diaphragm 2|, the outlet pressure in main |4| will be increased or boosted with increased rate of iiow. This is explained by the fact that the loading pressure in chamber exerted on diaphragm 95 is not balanced out completely but part becomes additive to the loading and therefore requires a higher control pressure to close the valve I6. This higher control pressure is supplied when the pressure in main |4| builds up. Accordingly, I wish it to be understood that my invention .is not limited to diaphragms of equal area unless expressly so stated in the claims.

This modiiication operates substantially like the modication If it is desired to bleed the loading pressure to atmosphere, the regulator |50 of Figure 8 is modied with the bleed oriiice arrangement of Figure 6. In this modification the spring |49 may be omitted, if desired.

In Figure 9 I have shown a back pressure pilot regulator for controlling the main regulator. The back pressure regulator |50 may be constructed as illustrated in Figure 1 with the bleed arrangement of Figures 3, 5 and 6, passage |29 being closed by plug |31. Control chamber I 2| in this modiii'cation is connected by the passages |35, |36 to the high pressure source entering by conduit |52 and the regulator thus is controlled by the back pressure in main |40. Loading chamber |20 connects by passages |22 and I 23 and connection |24 to the chamber |41 above diaphragm |45, and. the pressure bleeds through orifice |32 and conduits |51 and 53, to the low pressure main 4|.

In Figure 'la I have shown an intermittent bleed attachment which may be applied to any of the modifications shown in Figures 1, 2 or 3, or to a back pressure modification illustrated in Figures 6 and 7.

In applying this attachment, for example, to the modication shown in Figure 3, the plug 82, bushing |I6, thimble III, piston I I3 and spring ||4 are removed and replaced by the assembly shown in Figure 7a. This assembly comprises a bushing |60 having a threaded end adapted to be received in the threaded bore 1 of the body I, a felt washer |62 being provided as a closure. Bushing |60 is bored at |63 to receive a noncircular rod |64 which is enlarged at its inner end to provide an abutment |65 against which toggle link 4| abuts. Bore |63 is machined to provide a valve seat |66 and the opposite end of rod |64 carries a valve member comprising a cap |61 having an insert |68 adapted to engage valve seat |66. A screw |69 holds the valve member in position. A washer |6I is provided to prevent leakage and by selection of the thickness of this washer the seating of valve |61 may be adjusted. Plug |1| threaded in the bore |12 of the bushing |60 has an orifice |13 therethrough and a boss |14 serves as a center for a spring |15 which engages valve member |61. A plug 16 having a hole |11 therein may be provided to prevent accidental displacement of plug I1| In operation the spring |15 is made strong enough so that it will keep valve |61 closed and retain abutment |65 in position so that the regulator may control valve I6 in the usual manner. However, should the control pressure rise too high it will raise the diaphragm assembly causing the toggle links to tend to straighten and first close valve I6, then upon further increase in control pressure it will unseat valve |61, thus bleeding the loading pressure to the atmosphere until the control pressure falls low enough to enable valve |61 to close again. This modification is of particular utility in connection with a motor valve, the loading chamber |20 being connected to the diaphragm head of the motor valve. By a motor valve, I mean a structure such as the main regulator shown in Figures 8v and 9 in which chamber |48 is vented to atmosphere and pipe connection |54 is omitted.

What I claim and desire to secure by Letters Patent of the United States is:

1. A fluid pressure regulator comprising a body, a diaphragm secured at its peripery to the body and providing a. iluid pressure chamber on one side thereof, an inlet and outlet for said chamber, a valve for controlling said inlet, a plurality of toggle links normally positioned oft center connecting said valve and diaphragm, a. second diaphragm connected to said first diaphragm and closing said chamber, and a cover for said second diaphragm forming a control chamber therewith and having a control connection.

2. A fluid pressure regulator comprising a, body, a diaphragm secured at its periphery to the body and providing a iiuid pressure responsive, chamber, on one side thereof, an inlet and outlet for said chamber, a valve for controlling said inlet, an extension member connected to said diaphragm, means to guide said extension member, a second diaphragm secured at its center to said extension member and at its periphery tosaid body and forming a wall of said pressure responsive chamber, the effective areas of said diaphragm being substantially equal, a, toggle link between said extension member and valve in the space between said diaphragms, a second toggle link abutting said first toggle link at one end and engaging an abutment at its opposite end, meansk for biasing said toggle links to off center position, and a cover for said second diaphragm forming a control chamber therewith and having a control connection.

3. A uid pressure regulator comprising a body open at its ends, a pair of diaphragms connected together for conjoint movement Aand closing the ends of said body to form a, iiuid pressure chamber therebetween, a cover for one of said diaphragms forming a control chamber therewith, a control connection for said control chamber, an inlet connection for said fluid pressure chamber, valve means operated by said diaphragms for controlling said inlet connection, and a. bleed connection between saidfiuid pressure chamber and control chamber.

4. A uid pressure regulator comprising a body open at its ends, a pair of diaphragms connected together and closing the endsof said body to form a uid pressure chamber therebetween, a cover for one of said diaphragms forming a control chamber therewith, a control connection for said control chamber, an inlet connection for said fluid pressure chamber, valve means for control'- ling said inlet connection, a plurality of toggle links connecting said valve means and diaphragms, a bleed connection between said fluid pressure chamber and control chamber.

5. A uid pressure regulator comprising a body open at its ends, a pair of diaphragme connected together and closing the ends oi said body to form a fluid pressure responsive chamber therebetween, a pair of tubular spokes extending into said chamber from the body to provide a hub, an extension member connected to said diaphragms, and guided in said hub, an inlet in one of said spokes of said chamber, a valve movable in one of said spokes for controlling said inlet, a toggle link connecting said valve and extension member, and a cover for one of said diaphragms forming a control chamber therewith and having a control connection.

6. A fluid pressure regulator comprising a body open at its ends, a pair of diaphragms connected together and closing the ends of said body to form a iluid pressure responsive chamber therebetween, an internal hollow hub having hollow spokes radiating therefrom, an inlet for said chamber in one of said spokes, a valve movable in one of said spokes and guided therein for controlling said inlet, an extension member guided in said hub connected to said diaphragms, a transversely slidable shoe in said extension member, a toggle link connecting said shoe and valve, an abutment in the other of said spokes, a toggle link connecting said shoe and abutment, and a cover for one of said diaphragms forming a control chamber therewith and having a control connection.

7. A fluid pressure regulator comprising a main regulator valve and a diaphragm connected thereto forming iiuid pressure responsive chambers on opposite sides thereof, means connecting one of said uid pressure responsive chambers to the pressure source to be controlled, means for supplying ow of uid under pressure to the other of said iluid pressure responsive chambers, said latter means including a valve, a pair of diaphragms connected to said latter valve and providing a loading chamber therebetween and a control chamber on one side thereof, a conduit connecting said loading chamber to said other fluid pressure responsive chamber, a conduit connected from said second mentioned means to said control chamber, and means to bleed uid from the loading chamber.

8. A uid pressure regulator comprising a main regulator valve and a -ciiaphragm connected thereto forming uid pressure responsive chambers on opposite sides thereof, means connecting one of said uid pressure responsive chambers to the pressure source to be controlled, means for supplying a flow of fluid under pressure to the other of said fluid pressure responsive chambers, said latter means including a, valve, a pair of diaphragms connected to said latter valve and providing a loading chamber therebetween and a control chamber on one side thereof, a conduit connecting said loading chamber to said other iiuid pressure responsive chamber, and a conduit one side to the pressure in said chamber, a spacersecured to said diaphragms having a transverse bore therein, a valve for controlling said inlet, means connecting said valve with said diaphragms comprising a plurality of toggle links extending into said bore in abutting relation and normally positioned off center, and means for adjusting the pivot position of one of the toggle links.

FREDERICK H. KINDL. 

